Holley Sniper Stealth 4150 Self-Tuning Kit With Gold Finish



  • Supports 650HP
  • Bolts On Most 4bbl Manifolds
  • Easy 4 Wire Setup
  • Self Tuning ECU
MSRP $1,584.00
You save 10%

Holley Sniper Stealth 4150 Self-Tuning Kit With Gold Finish.

This Sniper Stealth 4150 EFI System (550-872) from Holley converts any 4-bbl carbureted engine using a 4150-style flange to fuel injection. No tuning is required to make these kits run, regardless of displacement or power level up to 650 horsepower. Fuel injection provides self-learning fuel and ignition control. This improves idle quality, startup reliability, drivability, and maintains performance in any altitude or temperature.

Features and Benefits:
- Only 4 wiring connections required! (Battery +, battery - , switched ignition & RPM)
- Stealthy, unnoticeable wiring
- Easy access to the distributor
- Three programmable 0-5V sensor inputs for oil/fuel/dome or nitrous pressure sensors
- Six programmable ground outputs for external fans, nitrous or boost control solenoids
- One +5v reference output - +5V power supply for 0-5v sensors
- One sensor ground – ground supply for 0-5v sensors
- Integrated ignition timing control improves idle, drive-ability, and throttle response
- High resolution full color touchscreen for initial setup, tuning, and gauge displays
- The included Bosch LSU 4.9 wideband oxygen sensor provides real time fuel map learn!
- OEM style TPS/IAC and fuel pressure regulator, for years of dependable service
- Included clamp-on oxygen sensor kit for 2.25" exhaust
- Fits most stock style air cleaners

The throttle body mounted ECU will bolt directly on to most 4150 intake flanges, and accommodate factory-style air cleaners for a carbureted appearance. The kit can also plumb directly into the existing carbureted fuel system.

The wiring is simple, and a full self-tuning capability makes setting up this system easy. Kickdown provisions for GM or Ford automatic transmissions are also included, for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications.

Please Note:
This EFI Kit will require the use of an electric high-pressure fuel pump, this kit will not work with a mechanical fuel pump. For 1965-1968 Mustang applications we recommend using (FTKEFI10) and for 1969-1970 Mustang applications we recommend using (FTKEFI11).

This Kit Includes:
- Holley Sniper EFI 4150 Throttle Body
- High Resolution Full Color Touchscreen Tablet
- Main Harness and Ignition Adapter
- Output Harness
- Bosch LSU Wideband Oxygen Sensor
- Clamp on Oxygen Sensor Kit
- Holley Sniper EFI Software
- Coolant Temperature Sensor
- Air Cleaner Gasket & Flange Gasket

- CFM: 870
- Finish: Gold
- Flange Style: 4150
- Height: 3.28”
- Injector Size: 100 lb/hr @ 58.5 PSI
- Inlet/Outlet Size: 3/4-16 Female O-Ring (AN 8)
- Map Sensor: 2 Bar
- Max Horsepower Rating: 650 Naturally Aspirated

California Residents: Proposition 65 Warning

Only for use on pre-pollution controlled vehicles: This product can be used on vehicles that were manufactured before emissions control regulations were imposed. Pre-pollution vehicles are defined as:

  • 1965 and older U.S. manufactured California certified vehicles
  • 1967 and older U.S. manufactured federally certified vehicles

Vehicle Fitment

This product will fit the following Bronco years:

This product will fit the following C10 years:

This product will fit the following F-100 years:

This product will fit the following Mustang years:

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